Maruka U.S.A. Inc. used NPE 2003 to roll out the largest Toyo all-electric injection press - a 750-ton machine under the new SI-II series.
In Chicago, the machine was molding a pop-up product display from polystyrene. A Wittmann robot removed the 3-pound part and carried it the entire length of the machine.
Regional manager Jerry Johnson said the SI-II series replaces Toyo's SI all-electric line. The company said the larger, 750-ton size shows Toyo wants to change its image of making only small and midsize injection molding machines.
Maruka U.S.A. in Rockaway, N.J., handles sales and service of presses built by Toyo Machinery & Metal Co. Ltd. of Osaka, Japan.
Officials from Maruka said the 750-ton Toyo compares favorably with electric presses that have 900 tons of clamping force. The platen size is 60.6 inches by 60.6 inches. The distance between the tie bars is 45 inches by 45 inches. Shot capacity ranges from 131.5-159.2 ounces.
Maruka also showed a smaller all-electric, a 150-ton press that was monitored remotely from a laptop computer using wireless communication.
The company said the Toyo electric presses require about one-third of the electric power needed by hydraulic machines. The SI-II machines are powered by a belt-and-ball-screw mechanism.
Under a new metering control system called Super Resin Control II (SRC), the screw applies pressure to the melt for a short time after metering, which Toyo said evens out the melt density so that parts weigh exactly the same on every cycle. The optional SRC-III includes a special check ring
The SI-II machines include a user-friendly PLCS-10 controller. The screw speed tops out at 300 millimeters per second.
Also at the show, held June 23-27, the company ran parts on a 90-ton Plastar hydraulic press with vertical clamp and horizontal injection.